{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8140-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8140-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8140-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8140-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 5SY8140-7, 1-pole, C characteristic, 40 A (45 °C), 25 kA IEC 60947-2, 15 kA DC, 5 kA UL 1077, 1 MWU, IP20.","salesMarkdown":"Ambient temperature derating is built in: at 50 °C the continuous rating drops to 39 A, at 55 °C to 37.96 A. That matters if the breaker sits inside a hot, poorly ventilated enclosure near the mill. The quick-assembly system and combined terminals top and bottom let a wireman land incoming and outgoing conductors without re-terminating the busbar. Sealable and touch-protected, with IP20 rating once conductors are connected. Halogen-free and silicon-free construction matters when the breaker lives near sensitive electronics or in areas with strict smoke-toxicity specs. Listed under UL 1077 and CSA C22.2 No. 235 with a 5 kA interrupting rating — enough for North American panelboard branch circuits. The IEC 60947-2 rating of 25 kA covers most European and global industrial installations. Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) means it shrugs off the vibration on a crusher floor. Production status is current; the part is in active manufacture.","metaTitle":"Siemens 5SY8140-7 SENTRON MCB, 1P C 40 A, 25 kA","metaDescription":"Siemens 5SY8140-7 SENTRON miniature circuit breaker, 1-pole, C-curve, 40 A rated at 45 °C, 25 kA IEC breaking capacity, 5 kA UL 1077. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SY8140-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 230/400 V D=70 mm 25 kA according to EN 60947-2, 1P, C40","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"40 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"1P","acc. to DIN EN 61346-2":"F","at 45 °C / rated value":"40 A","at 50 °C / rated value":"39 A","at 55 °C / rated value":"37.96 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"25 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ea1b73cf0fba02df2e69d133b2c2e26f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=108363&mlfb=5SY8140-7"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SY8140-7?","answer":"25 kA per IEC 60947-2 at 400 V AC, 15 kA at DC per the same standard, and 5 kA per UL 1077 / CSA C22.2 No. 235."},{"question":"Will the 5SY8140-7 drop into a panel specified for 5SY4116-7CV?","answer":"Both are 1-pole SENTRON MCBs with the same 18 mm width and DIN-rail mounting, so mechanical fit is identical. The 5SY8140-7 carries a 40 A C-curve versus the lower-rated 5SY4116-7CV; verify the branch circuit ampacity and coordination before swapping."},{"question":"Where can I buy the 5SY8140-7 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8140-7","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SY8140-7 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}